bpf: Disable migration in nf_hook_run_bpf().

{
  "id": "2fefcfd7f402cefa95816d5cc6d04a63db9f160d5f0a7795e7a002763d69f3e2",
  "url": "https://osv.dev/vulnerability/CVE-2025-38640",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "bpf: Disable migration in nf_hook_run_bpf().",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: bpf: Disable migration in nf_hook_run_bpf(). syzbot reported that the netfilter bpf prog can be called without migration disabled in xmit path. Then the assertion in __bpf_prog_run() fails, triggering the splat below. [0] Let's use bpf_prog_run_pin_on_cpu() in nf_hook_run_bpf(). [0]: BUG: assuming non migratable context at ./include/linux/filter.h:703 in_atomic(): 0, irqs_disabled(): 0, migration_disabled() 0 pid: 5829, name: sshd-session 3 locks held by sshd-session/5829: #0: ffff88807b4e4218 (sk_lock-AF_INET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1667 [inline] #0: ffff88807b4e4218 (sk_lock-AF_INET){+.+.}-{0:0}, at: tcp_sendmsg+0x20/0x50 net/ipv4/tcp.c:1395 #1: ffffffff8e5c4e00 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #1: ffffffff8e5c4e00 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline] #1: ffffffff8e5c4e00 (rcu_read_lock){....}-{1:3}, at: __ip_queue_xmit+0x69/0x26c0 net/ipv4/ip_output.c:470 #2: ffffffff8e5c4e00 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #2: ffffffff8e5c4e00 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline] #2: ffffffff8e5c4e00 (rcu_read_lock){....}-{1:3}, at: nf_hook+0xb2/0x680 include/linux/netfilter.h:241 CPU: 0 UID: 0 PID: 5829 Comm: sshd-session Not tainted 6.16.0-rc6-syzkaller-00002-g155a3c003e55 #0 PREEMPT(full) Hard",
    "evidence": "osv:CVE-2025-38640",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.6.102",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.42",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.15.10",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.16.1",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2025-38640",
      "aliases": [
        "CVE-2025-38640"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "fd9c663b9ad67dedfc9a3fd3429ddd3e83782b4d"
                },
                {
                  "fixed": "ee2502485702e4398cd74dbfb288bfa111d25e62"
                },
                {
                  "fixed": "62f6175d145e00fc999fd2fcbffad3f59253c66a"
                },
                {
                  "fixed": "e0199c28167a8a4adec036005a8df268b2b68529"
                },
                {
                  "fixed": "0a356da16fb933abbeeb7aea038c351f3342cd3f"
                },
                {
                  "fixed": "17ce3e5949bc37557305ad46316f41c7875d6366"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-38640.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.4.0"
                },
                {
                  "fixed": "6.6.102"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.42"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.15.10"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.16.0"
                },
                {
                  "fixed": "6.16.1"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-38640.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:52.951824727Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0a356da16fb933abbeeb7aea038c351f3342cd3f",
        "https://git.kernel.org/stable/c/17ce3e5949bc37557305ad46316f41c7875d6366",
        "https://git.kernel.org/stable/c/62f6175d145e00fc999fd2fcbffad3f59253c66a",
        "https://git.kernel.org/stable/c/e0199c28167a8a4adec036005a8df268b2b68529",
        "https://git.kernel.org/stable/c/ee2502485702e4398cd74dbfb288bfa111d25e62",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38640.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-38640",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38640.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-38640",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 521512,
  "published_at": "2025-08-22T16:00:46.76+00:00"
}